saltstack的grains类似于ansible的setup模块,主要作用为手机客户端的主机基本信息(cpu,内核,os,virtual等),定义在客户端
[root@k8s_master ~]# cat /etc/salt/master |grep -v "^#\|^$"
cachedir: /var/cache/salt/master
auto_accept: True
file_recv: True
file_roots:
base:
- /root
nodegroups:
master1: 'L@k8s_master'
agents: 'L@k8s_node1,k8s_node2'
查看主机的详细信息
salt -N 'master1' grains.items
查看所有键(saltstack自带)
[root@k8s_master ~]# salt -N master1 grains.ls
k8s_master:
- SSDs
- biosreleasedate
- biosversion
- cpu_flags
- cpu_model
- cpuarch
- domain
- fqdn
- fqdn_ip4
- fqdn_ip6
- gpus
- host
- hwaddr_interfaces
- id
- init
- ip4_interfaces
- ip6_interfaces
- ip_interfaces
- ipv4
- ipv6
- kernel
- kernelrelease
- locale_info
- localhost
- lsb_distrib_id
- machine_id
- manufacturer
- master
- mdadm
- mem_total
- nodename
- num_cpus
- num_gpus
- os
- os_family
- osarch
- oscodename
- osfinger
- osfullname
- osmajorrelease
- osrelease
- osrelease_info
- path
- productname
- ps
- pythonexecutable
- pythonpath
- pythonversion
- saltpath
- saltversion
- saltversioninfo
- selinux
- serialnumber
- server_id
- shell
- systemd
- virtual
- zmqversion
用法示例: salt <匹配主机> grains.item <grains.ls>获取的键
[root@k8s_master ~]# salt -N master1 grains.item ipv4
k8s_master:
----------
ipv4:
- 10.1.14.0
- 127.0.0.1
- 172.17.0.1
- 192.168.132.148
自定义grains键及数据
首先,主控端(master端)编写获取数据的脚本,然后同步到客户端(minion),在主控端的base目录(在/etc/salt/master配置文件中指定的目录,默认为/srv/salt目录)下生成_grains目录,执行install -d /srv/salt/_grains开始编写代码(此例子为获取主机系统允许的最大打开文件数)
[root@k8s_master ~]# cat /root/_grains/test_grains.py
#!/usr/bin/env python
#-*-coding:utf-8-*- import os,sys,commands def get_custom_grains():
grains = {}
_open_file=65535
try:
getulimit = commands.getstatusoutput('source /etc/profile;ulimit -n') ##获取客户端文件描述符数量(可通过其他命令获取)
except Exception,e:
print e
#print getulimit,type(getulimit) #此处打印的为一个元组
if getulimit[0] == 0:
_open_file=int(getulimit[1])
grains['max_open_files'] = _open_file #为grains的新键(max_open_files)赋值 为_open_file
return grains #返回grains返回值
同步并检查本地文件
[root@k8s_master ~]# salt 'k8s_master' saltutil.sync_all
[root@k8s_master ~]# ls /var/cache/salt/minion/files/base/_grains/test_grains.py #生成文件
/var/cache/salt/minion/files/base/_grains/test_grains.py
[root@k8s_master ~]# ls /var/cache/salt/minion/extmods/grains/test_grains.py
/var/cache/salt/minion/extmods/grains/test_grains.py
重新加载模块(刷新模块)
[root@k8s_master ~]# salt 'k8s_master' sys.reload_modules #刷新重载模块
k8s_master:
True [root@k8s_master ~]# ls /var/cache/salt/minion/extmods/grains/test_grains.py #增加了pyc文件
test_grains.py test_grains.pyc
主控端查看grains信息
[root@k8s_master ~]# salt 'k8s_master' grains.item max_open_files
k8s_master:
----------
max_open_files:
1024
[root@k8s_master ~]# salt 'k8s_node1' grains.item max_open_files #没有添加的则不能显示
k8s_node1:
----------
max_open_files:
引用:
采用jinja模板
{ % if grains['os'] == 'centos' % } host:{{ grains['host'] }} { % elif grains['os'] == 'RedHat' % } host: {{ grains['fqdn'] }} { % endif % }
注:在模板引擎里使用的时候遵循python列表和字典取值规则,如,获取某个主机某个网卡的ip地址
{{ grains['ip4_interfaces']['ens33'][] }}